my bitch should be 3 weeks pregnant, what signs might i be seeing if she is?

There is an excellent book called "The Book Of The Bitch" which ALL bitch owners should own.  It will give you a lot of information regarding pregnancy and bitch problems and answer most of your questions.

With regard to your question - you may not see any signs, bitches vary.  Some will get enlarged (almost spreading) nipp*les or morning sickness, become more clingy or more aloof, become more full of energy or just want ot lay in the sun - they all vary.

have a look here Guest

Canine Pregnancy Calendar

I dont believe in a scan unless its necessary or they are over 6 weeks in whelp because I have herd that it can separate the puppy from the placenta anyway as said above the book of the bitch is very good we have one and I have learnt alot from it I have always been around when our dogs have puppies but I would let mum do it for now as am only 15 and dont wont to do anything wrong
Dont forget everyone learns for life no matter how good you are
Good luck with your bitch
bye bye for now Fiona